linux-kernel - Re: [PATCH 0/7] de-stage SW

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Date:	Mon, 8 Aug 2016 16:53:39 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Gustavo Padovan <gustavo.padovan@...labora.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH 0/7] de-stage SW_SYNC validation frawework

2016-07-24 Pavel Machek <pavel@....cz>:

> On Mon 2016-08-08 16:08:12, Gustavo Padovan wrote:
> > 2016-08-07 Pavel Machek <pavel@....cz>:
> > 
> > > On Sun 2016-07-24 15:21:11, Greg Kroah-Hartman wrote:
> > > > On Mon, Jul 18, 2016 at 04:12:45PM -0300, Gustavo Padovan wrote:
> > > > > Hi,
> > > > > 
> > > > > Do you think there is time to get this in for 4.8?
> > > > 
> > > > No, it was too late on my end, due to travel and vacation, sorry.  I'll
> > > > queue it up for 4.9-rc1.
> > > 
> > > Could we get some documentation what this does? Is it visilble to
> > > userspace?
> > 
> > This interface is only intended for testing and validation, there are
> > ioctls on the debugfs file that can be accessed by userspace but there
> > isn't any exported kernel header with this info. The tester should know
> > and add a internal header to be able to access it. We want to prevent
> > people from misusing this feature by not advertising it nor providing
> > documentation.
> 
> You are playing dangerous game here. debugfs is not normally considered stable,
> but otoh... ioctls on debugfs?
> 
> Anyway, please provide some documentation. Kernel hackers need to know what this does.

Okay, where do you think is the best place? Would documentation inside
the .c file suffice for you?